Materials Literature
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Phase transitions of orthorhombic sulfur were investigated above 10 GPa by Raman spectroscopy using red light excitation. Transitions into several phases that have been reported in previous studies using green light excitation, are confirmed. The phase behaviour is observed to depend strongly on the preparation method…
The acetone-sensitized irradiation using UV-B (ultraviolet light, 280-320 nm; sunlamps) of thymidylyl(3'-->5')deoxyfluorouridine monophosphate produces two main photoproducts. The distribution of these photoproducts is dependent on the pH of the irradiation solution. At pH 6, the cis-syn cyclobutane-type photodimer is…
Sea ice algal assemblages in the arctic region are mainly represented by marine diatoms (Bacillariophyta), dominated by species of Navicula Bory, Pinnularia Ehrenberg, Gyrosigma Hassall and Pleurosigma W. Smith. The examination of historical and modern ice diatom collections reveals that Navicula kryophila, first desc…
Alumina and silica coatings have been deposited by MOCVD (Metal Organic Chemical Vapor Deposition) on alloys to protect them against high temperature corrosion. Aluminium Tri-lsopropoxide (ATI) and DiAcetoxyDitertiaryButoxySilane (DAOBS) have been used as metal organic precursors to prepare these ceramic coatings. The…
The nature of atomic bond-orientational anisotropy and order in liquids and glasses is considered based upon recent molecular dynamics studies. A possibility of spin-glass-like freezing of the local bond-orientational order (BOO) parameter is demonstrated. A close relationship between the anelasticity of metallic glas…
The thermodynamic properties of the Ti–W system have been assessed on the basis of the descriptions of pure Ti and W included in the Scientific Group Thermodata Europe database. The assessment method involves the use of models for the Gibbs energy of the various phases of the system, and interaction parameters in the…
This paper is composed of two parts: theoretical and experimental. The theoretical part is divided into several sections. The main characteristic properties of 3d (transition metals) and 4f (rare-earth metals) magnetism are explained in the second section. The properties of rare-earth-transition metal compounds are di…
Summary Natural corrosion crusts on potash—lime—silica glasses, that have been buried in soil for very long periods, were examined using infra‐red reflectance microspectroscopy and electron‐probe techniques. Individually these techniques are useful: infra‐red provides information on which functional groups are present…
The discrete phonon spectra of TiO2 quantum dot with a dipole layer is reported. The absorption intensities of different LO phonons are related to the phonon-electron coupling in accord with the prediction of the continuum polarization model. The two-phonon bound state appeared due to the localization effect. The opti…
A microscopic model is developed to describe statistical properties of a nematic phase consisting of semiflexible dimers. The effect of the spacer chain bonding the two mesogens is described by the local conditional probability in terms of a bare stiffness parameter Ω∼EB/kT and a bare equilibrium angle θ0 between meso…
Film thickness and temperature are two of the most important quantities in semiconductor manufacturing. They play a fundamental role in many standard production techniques like chemical vapor deposition (CVD, LPCVD, PECVD), thermal oxidation and diffusion. They are especially important for more recently developed tech…
Potentiodynamic testing was used to study the corrosion performance of low-residual carbon steels in a sour brine, as typically encountered in Kuwaiti oil fields. Twenty-eight tests were performed to determine the effects of variations of carbon content from 0.1 to 0.4%; 1, 2, and 3% additions of cobalt; and 1, 2, and…
Various methods are discussed for the joining of ceramics to metals and vice versa. State‐of‐the‐art techniques including refractory metallizations and active metal brazing are detailed from both a processing and applications standpoint. Various approaches to forming ceramic/metal joints or thin film coatings have bee…
Since the discovery of the organic superconductivity more than 10 years ago with a critical temperature (TS) of 1 K in quasi one dimensional (1D) conductors based on the tetramethyltetraselenafulvalene molecule, more than 40 organic superconductors are now known, achieving TS up to about 13 K. These salts are made of…
This work describes derivation of a control model for electrode melting and heat and mass transfer from the electrode to the work piece in gas metal arc welding (GMAW). Specifically, a model is developed which allows electrode speed and welding speed to be calculated for given values of voltage and torch-to-base metal…
Polyolefins, such as polypropylene and polyethylene, are among the most commonly-utilized plastics in the world, but, because of their non-polar surfaces, are among the most difficult to bond with adhesives. A surface treatment is required before adhesive application to achieve good adhesion. Alkyl cyanoacrylates are…
Polyanniline films containing TiO 2 particles have been shown to be an effective medium for photo‐induced electrochromism. This effect has been utilized to achieve image storage and writing with laser light in the polyaniline films. The production of the films, their applications, and directions for future work, inclu…
A comparative study was performed on two TiO 2 (110) surfaces: one annealed in vacuum, the other annealed in hydrogen. Local geometric and electronic structures were characterized using scanning tunneling microscopy and spectroscopy, in conjunction with conventional surface analytical techniques. Each surface exhibite…
Liquid crystalline copolyesters of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, with compositions 20/80 and 24/76, were studied in order to evaluate the effect of higher melting HBA/HNA copolyesters on the high temperature adhesive properties compared with data for the recently reported 73/27 system. A tetram…
It has been observed that the adhesion between vacuum-evaporated aluminum and poly(ethylene isophthalate-co-ethylene sodium sulfoisophthalate) copolymer is approximately five times greater than the adhesion between vacuum-evaporated aluminum and biaxially-oriented poly(ethylene terephthalate) film. To describe the int…